PEB 2091
PEF 2091
Programming
6.8.5
Partial Activation (U Only)
Activating the U-interface only partially is a requirement specified by the CNET. The
S-interface remains deactivated.
When activating partially from the LT side, the exchange has two options:
First, in case the C/I-command DC is not issued after the partial activation is complete,
the exchange has to issue AR before a terminal initiated complete activation request is
accepted (see 6.8.7, case 1). This allows the exchange to retain full control, even in case
of terminal initiated activation requests.
Secondly the exchange can issue DC after UAI has been received. This allows the
terminal to activate the S-interface independently of the exchange (see 6.8.7, case 2). In
this case the exchange has no control of the S-interface activation procedure.
NT
LT
<––––– C/I DC
–––––> C/I DI
(1111B)
(1111B)
C/I DC
C/I DI
(1111B) <––––– ; Initial state is "Deactivated"
(1111B) –––––>
C/I UAR
C/I AR
(0111B) <––––– ; Start partial activation
(1000B) –––––> ; Activation proceeds
(1001B) –––––> ; :
(0111B) –––––> ; Partial activation complete
(1111B)] <––––– ; Exchange retains no
; control of S-interface
<––––– C/I PU
<––––– C/I DC
(0111B)
(1111B)
C/I ARM
C/I UAI
[C/I DC
activation
6.8.6
Complete Activation Initiated by LT with U Active
When U is already active, the S-interface can be activated either by the exchange or the
terminal. The first case is described here, the second in the next section.
NT
LT
<––––– C/I DC
–––––> C/I DI
(1111B)
(1111B)
C/I UAR [DC]
<––––– ; U only is activated
C/I UAI
(0111B) –––––> ; [exchange retains no
; control]
C/I AR
(1000B) <––––– ; Start complete activation
<––––– C/I AR
–––––> C/I AR
(1000B)
(1100B)
C/I AR
(1000B) –––––> ; Activation proceeds
; Confirm that terminal is
; active
–––––> C/I AI
(1100B)
(1100B)
C/I UAI
C/I AI
(0111B) –––––>
(1100B) –––––> ; Activation complete
<––––– C/I AI
Semiconductor Group
244
Data Sheet 01.99
INFINEON [ Infineon ]
